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Volumn 108, Issue 45, 2004, Pages 9733-9741

Use of a flowing afterglow SIFT apparatus to study the reactions of ions with organic radicals

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC RADICALS; FLOWING AFTERGLOW SELECTED ION FLOW TUBE (SIFT); ORGANIC RADICALS; OXYACETYLENE FLAMES;

EID: 9144237585     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp047792u     Document Type: Article
Times cited : (18)

References (73)
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    • A more recent measurement reports 8.133 ± 0.001 eV and the small discrepancy remains unresolved. [Liang, C.; Chen, C.; Wei, C.; Chen, Y. J. Chem. Phys. 2002, 116, 4162].
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    • NIST Standard Reference Database Number 69; March, 2003 release and references therein
    • Unless otherwise specified, all thermochemical values have been taken or derived from NIST Chemistry Webbook, NIST Standard Reference Database Number 69; March, 2003 release and references therein.
    • NIST Chemistry Webbook
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    • Jona, P.; Gussoni, M.; Zerbi, G. J. Phys. Chem. 1981, 85, 2210. The vibrational frequencies for HCC-CCH come from the NIST Chemistry Webbook.
    • (1981) J. Phys. Chem. , vol.85 , pp. 2210
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  • 30
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    • Jona, P.; Gussoni, M.; Zerbi, G. J. Phys. Chem. 1981, 85, 2210. The vibrational frequencies for HCC-CCH come from the NIST Chemistry Webbook.
    • NIST Chemistry Webbook
  • 35
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    • note
    • Near the beginning of the SIFT reaction flow tube (20-30 cm), the ion/He flow is turbulent. Further downstream, the ion/He flow becomes laminar. Injecting the radical/He pulse into the turbulent region causes the mixing of the radicals and the ions to be relatively fast.
  • 37
  • 39
    • 9144232036 scopus 로고    scopus 로고
    • note
    • In fact, the packet (or ion/radical reaction zone) is not plug shaped, since the initial section of the reaction flow tube is characterized by turbulent flow. Downstream, the packet shape will be affected by the parabolic velocity profile of the laminar He flow. The exact shape and volume of the packet is difficult to calculate.
  • 40
    • 9144246387 scopus 로고    scopus 로고
    • note
    • nd law of diffusion to calculate the diffusion distance for the radicals in the packet (see F. M. White, Heat and Mass Transfer; Chapter 11 and Appendices L and M). After the 10 ms transit time, the packet has expanded by about 3 cm in length. The loss of inert radicals (such as allyl) at the wall following radial diffusion will be small.
  • 42
    • 9144223246 scopus 로고    scopus 로고
    • note
    • Increasing the duty cycle will increase the product ion signal intensity. An increased duty cycle requires an increase in the repetition rate of the pulsed valve for the nozzle. However, since at high nozzle temperatures the pulse width becomes unstable when the frequency of the pulsed valve is high, we used the repetition rate of 20-40 Hz in our experiment to have a stable pulse width. Improving the stability of the pulse width at high frequency is in progress.
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    • Heats of formation of organic free radicals by Kinetic methods
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    • note
    • 5COOH + HCl.
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    • in preparation
    • Kato, S. et al., in preparation.
    • Kato, S.1
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    • -.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.